Black Box MWU2000-X21 - Manual (Page 13)

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2.048Mbps Wireless Modem
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E1
The rear panel connector module consists of one E1/CEPT-1 balanced (RJ-45) connector and
two unbalanced (2 x BNC) connectors.
Fractional E1 (with Echo Cancellation)
The rear panel connector module consists of one E1/CEPT-1 balanced (RJ-45) connector and
two unbalanced (2 x BNC) connectors
Figure 1-5. 2.048Mbps Wireless Modem Rear Panel (E1 LIU and Fractional E1 LIU)
T1
The rear panel connector module consists of one T1/DSX-1 balanced (RJ-45) connector.
Fractional T1 (With Echo Cancellation)
The rear panel connector module consists of one T1/DSX-1 balanced (RJ-45) connector.
Figure 1-6. 2.048Mbps Wireless Modem Rear Panel (T1 LIU and Fractional T1 LIU)
Refer to Appendix E for a description of the E1/T1 and Fractional E1/T1 pin assignments.
Modem
Separate DSP Transmit and Receive Modems
The physical layer connection is established by two DSP (Digital Signal Processing)
modems. Each modem is dedicated to one direction of the link; transmit or receive.
Adaptive Equalization
The time dispersion of the transmitted signal caused by multipath propagation causes inter-
symbol interference (ISI). To compensate for the ISI, an adaptive equalizer is included in the
modem.